Openwall GNU/*/Linux - a small security-enhanced Linux distro for servers
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date: Fri, 5 Jun 2015 17:34:23 +0530 (IST)
From: P J P <ppandit@...hat.com>
To: oss security list <oss-security@...ts.openwall.com>
cc: cve-assign@...re.org, "Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: Re: CVE request Linux kernel: ns: user namespaces
 panic

+-- On Thu, 4 Jun 2015, cve-assign@...re.org wrote --+
| >> From: ebiederm@...ssion.com (Eric W. Biederman)
| >> 
| >> The core issue is that a unprivileged user could call umount(MNT_DETACH)
| >> and in the right circumstances gain access to every file on essentially
| >> any filesystem in the mount namespace.
| >> 
| >> e0c9c0afd2fc958ffa34b697972721d81df8a56f mnt: Update detach_mounts to leave mounts connected
| >> is the real bug fix that fixes a fairly scary issue.
| >>
| >> So I believe cd4a40174b71acd021877341684d8bb1dc8ea4ae prevents a
| >> difficult to trigger crash if you have
| >> e0c9c0afd2fc958ffa34b697972721d81df8a56f applied.
| >>
|
| Use CVE-2015-4176 for the issue fixed in
| e0c9c0afd2fc958ffa34b697972721d81df8a56f. This code change is present
| in 4.0.2.
| 
| Use CVE-2015-4177 for the issue fixed in
| cd4a40174b71acd021877341684d8bb1dc8ea4ae. This code change is not
| present in 4.0.2.

  Ie IIUC, existence of CVE-2015-4177 depends on CVE-2015-4176 being fixed, 
which in turn depends on commit

  -> https://git.kernel.org/linus/ce07d891a0891d3c0d0c2d73d577490486b809e1

being present. (...Eric?)

--
Prasad J Pandit / Red Hat Product Security Team
47AF CE69 3A90 54AA 9045 1053 DD13 3D32 FE5B 041F

Powered by blists - more mailing lists

Your e-mail address:

Please check out the Open Source Software Security Wiki, which is counterpart to this mailing list.

Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.